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utils.go
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package inetdata
import (
"bufio"
"fmt"
"io"
"os"
"regexp"
mtbl "github.com/hdm/golang-mtbl"
)
var Match_SHA1 = regexp.MustCompile(`^[a-zA-Z0-9]{40}$`)
var MTBLCompressionTypes = map[string]int{
"none": mtbl.COMPRESSION_NONE,
"snappy": mtbl.COMPRESSION_SNAPPY,
"zlib": mtbl.COMPRESSION_ZLIB,
"lz4": mtbl.COMPRESSION_LZ4,
"lz4hc": mtbl.COMPRESSION_LZ4HC,
}
const MTBL_KEY_LIMIT = 1024 * 1024 * 512
const MTBL_VAL_LIMIT = 1024 * 1024 * 1024
var Split_WS = regexp.MustCompile(`\s+`)
func PrintVersion(app string) {
fmt.Fprintf(os.Stderr, "%s v%s\n", app, Version)
}
func ReverseKey(s string) string {
b := make([]byte, len(s))
var j int = len(s) - 1
for i := 0; i <= j; i++ {
b[j-i] = s[i]
}
return string(b)
}
func ReverseKeyBytes(s []byte) []byte {
b := make([]byte, len(s))
var j int = len(s) - 1
for i := 0; i <= j; i++ {
b[j-i] = s[i]
}
return b
}
func ReadLines(input *os.File, out chan<- string) error {
var (
frontbufferSize = 50000
r = bufio.NewReaderSize(input, frontbufferSize)
)
return ReadLinesFromReader(r, out)
}
func ReadLinesFromReader(input io.Reader, out chan<- string) error {
var (
backbufferSize = 200000
frontbufferSize = 50000
r = bufio.NewReaderSize(input, frontbufferSize)
buf []byte
pred []byte
err error
)
if backbufferSize <= frontbufferSize {
backbufferSize = (frontbufferSize / 3) * 4
}
for {
buf, err = r.ReadSlice('\n')
if err == bufio.ErrBufferFull {
if len(buf) == 0 {
continue
}
if pred == nil {
pred = make([]byte, len(buf), backbufferSize)
copy(pred, buf)
} else {
pred = append(pred, buf...)
}
continue
} else if err == io.EOF && len(buf) == 0 && len(pred) == 0 {
break
}
if len(pred) > 0 {
buf, pred = append(pred, buf...), pred[:0]
}
if len(buf) > 0 && buf[len(buf)-1] == '\n' {
buf = buf[:len(buf)-1]
}
if len(buf) == 0 {
continue
}
out <- string(buf)
}
close(out)
if err != nil && err != io.EOF {
return err
}
return nil
}